(A) The hazard group for an employer shall be determined as follows. The employer's primary manual classification will be determined based on the greatest amount of experience rated premium for the rating year beginning two years prior to the period in which the employer is seeking to participate in the individual retrospective rating program. The hazard group to which the employer's primary manual classification belongs, as presented in appendix C to rule 4123-17-72 of the Administrative Code, shall be the hazard group for that employer.
(B) The Ohio bureau of workers' compensation shall notify the employer of the estimated minimum premium percentage based on the limits selected by the employer and the payroll of the employer. The premium rates on the payroll reports received by the employer for the policy year will be calculated using the minimum premium per cent.